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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e94ab4bdce74c5702e286ed7f4b5e73ebedc0bf1e0579713f5346366b8d164' 
  AND token = 'he6yOG9gt/fsVIhR++k5ENNtOd6Jq+5f71e0XoM+b9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}